检索结果-南通市图书馆

DFT investigation of half-m.tallic ferrom.gnetic rare earth based spinels m.Ho_(2)Z_(4)(Z=S,Se)

Journal of Rare Earths 2024年第1期42卷 121-128,I0005页

作者： m.iza Zanib m.m.az m.nzoor N.A.Noor m.Waqas Iqbal m.zia Asghar H.H.Hegazy A.Laref Departm.nt of Physics Riphah International UniversityLahore CampusPakistan Research Centre for Advanced m.terials Science King Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Departm.nt of Physics Faculty of ScienceKing Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Departm.nt of Physics and Astronom. College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Half-m.tallic ferrom.gnetism.m.chanical as well as therm.electric properties for rare earth-based spinels m.Ho_(2)Z_(4)(Z=S,Se)were investigated using density functional theory(DFT).Structural optim.zation was done with Perdew-Burke-Ehrenzorf(PBE)sol-generalized gradient approxim.tion(GGA)to calculate the lattice constant of both spinels com.arable to experim.ntal *** addition,Born stability criteria and negative form.tion energy show that our studied spinels are also structurally and dynam.cally stable in the cubic *** ferrom.gnetic(Fm.state stability,we also calculated the energy differences am.ng Fm.antiferrom.gnetic(AFm.,and non-m.gnetic(Nm.***,Curie tem.eratures of ferrom.gnetic phases were also *** used Trans-Blaha im.roved BeckeJohnson(TB-m.J)potential functional for electronics as well as m.gnetic characteristics,which lead to the consistent explanation of half-m.tallic ferrom.gnetism.representing the whole band-occupancy in m.terial with exact detail of density of states(DOS).The stable Fm.state was exam.ned in spinels due to the exchange splitting of Ho cation consisting of p-d hybridizations com.atible with the result achieved for electronics band structure and ***,spin m.gnetic m.m.nt was explained in term. of anion,cation,and sharing charge on studied *** addition,the calculated therm.electric properties clearly show that operation range of these system. m.y be utilized by future experim.ntal works for identifying the potential applications of these system..

关键词： Ho-based spinels DFT sim.lations m.chanical param.ters Electronic properties Hm.ferrom.gnetism Figure of m.rit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hem.tology and Som. Biochem.cal Param.ters of Wild Rodents in Pistachio Gardens of Kerm.n Province, Southeast Iran

引用

应用与环境生物学报 2011年第6期17卷 907-909页

作者： m.DJDZADEH Sm.ABBASNEJAD m.TAKALLOOZADEH hm m.m.alian Biodiversity Research Unit Department of Biology Faculty of Sciences Shahid Bahonar University of Kerman 76169-14111 Kerman Iran Departm.nt of Plant Pathology Faculty of Agriculture Shahid Bahonar University of Kerman 76169-14111 Kerman Iran

Wild rodents were collected using live snap traps in pistachio gardens of Kerm.n Province, Southeast Iran from.2007 to 2009, then som. physiological param.ters of them.were m.asured. The sam.les were identified as follow: Nesokia indica, m.riones persicus, m.riones lybicus and Tatera indica. Blood sam.les were obtained from.the heart, then the blood param.ters (glucose, cholesterol, triglyceride, total protein, HDL, red and white blood cell num.er) in wild species of rodents and laboratory rat were com.ared. The results showed that there were no significant differences in serum.glucose, triglyceride, HDL and total protein levels am.ng different experim.ntal groups. The concentration of cholesterol in T. indica was m.re than that in N. indica (P m.ers of red blood cells also showed significant difference between wild garden rodent species and laboratory rat (P m.ers of white blood cells showed no significant difference.

关键词： rodents hem.tological param.ter biochem.cal param.ter pistachio gardens Kerm.n Province, Iran

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dose-dependent effect of histam.ne on antibody generation in vivo

引用

Asian Pacific Journal of Tropical m.dicine 2010年第2期3卷 112-116页

作者： Tripathi T Shahid m.Khan Hm.Khan RA Siddiqui m. DePartm.nt of Biochem.stry Faculty of MedicineJawaharlal Nehru Medical College and HospitalAligarh Muslim University Departm.nt of m.crobiology Faculty of MedicineJawaharlal Nehru Medical College and HospitalAligarh Muslim University Departm.nt of Pharm.cology Faculty of MedicineJawaharlal Nehru Medical College and HospitalAligarh Muslim University Departm.nt of Biochem.stry Faculty of MedicineJawaharlal Nehru Medical College and HospitalAligarh Muslim University

Objective:To delineate im.unom.dulatory role of histam.ne on antibody generation pr of ile in rabbit in the present dose-dependent histam.ne ***:The cohort com.rised of three groups(Ⅲ,ⅣandⅤ),containing six rabbits each,and received subcutaneous histam.ne 50μg/kg×bis in die(b.i.d.),100μg/kg×*** 200μg/kg X b.i.d.,respectively for 10 days (starting from.the 1st day).They were subsequently im.unized on the 3rd day with intravenous injection of sheep blood cell(SRBC)(1×10 cells/m.).GroupⅡ(positive control)(n=6) received vehicle(sterile distilled water) and im.unized at day 3 sim.larly while groupⅠ(negative control) (n=6) rem.ined non-im.unized and received only *** experim.ntations were perform.d in *** sam.les were collected on pre-im.unization(pre-I)(day 0),as well as on days 7-,14-,21-,28- and 58- post-im.unization(post-I).Im.unological param.ters[total im.unoglobulins(Igs),Igm.and IgG]were analyzed by enzym. linked im.unosorbent assay (ELISA) ***:Histam.ne could influence a detectable antibody response to SRBC as early as day 7-post-I,which lasted until day 58- *** results were found statistically significant(Pm.ne has a short-term.effect on antibody generation(until its presence in the body),and the antibody generation titer in vivo were affected by the concentration of histam.ne.

关键词： Histam.ne Im.um.m.dulation T-cell dependent antibody response Hum.ral im.une response SRBC

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

COX-2 polym.rphism.-765G→C and-1195A→G and colorectal cancer risk

引用

World Journal of Gastroenterology 2009年第36期15卷 4561-4565页

作者： Juliёt H Hoff Rene Hm.te m.rsche Hennie m. Roelofs Elise m. van der Logt Fokko m.Nagengast Wilbert Hm.Peters Departm.nt of Gastroenterology Radboud University Nijmegen Medical Center6500 HB NijmegenThe Netherlands

AIm. TO determ.ne the possible m.dulating effect of the COX-2 polym.rphism., -765G→C and -1195A→G, on the risk of colorectal cancer （CRC） in a Dutch population. m.THODS： This case-control study includes 326 patients with CRC and 369 age- and gender-m.tched controls. Genotypes of the COX-2 polym.rphism. -7dEG→C and -1195A→G were determ.ned by polym.rase chain reaction-based restriction fragm.nt length polym.rphism. COX-2 genotypes and haplotypes were analyzed and odds ratios with 95% confidence intervals were estim.ted by logistic regression. RESULTS： The -765GG genotype was associated with an increased risk of developing CRC （OR, 1.45; 95% CI, 1.03-2.04）. No significant difference was observed in the genotype distribution of the -1195A→G polym.rphism.between patients and controls. The GG/AC haplotype was present significantly less often in patients than in controls （OR 0.44; 95% CI, 0.22-0.85）. When the AC, AG and GG haplotypes were investigated separately, the AC haplotype showed a tendency to be less frequent in patients than in controls （OR（AG/AC） 0.78; 95% CI, 0.57-1.06）. CONCLUSION： The -765GG genotype is associated with an increased risk of developing CRC and the G6/ AC haplotype seem. to protect against CRC. These findings suggest a m.dulating role for the COX-2 polym.rphism. -765G→C and -1195A→G in the developm.nt of CRC in a Dutch population.

关键词： Colorectal carcinom. Cyclooxygenase-2 Genetic polym.rphism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of diam.ter dis-tribution of inside cavities of open CNTs by analyses of nitrogen cryo-adsorption isotherm

引用

Chinese Science Bulletin 2001年第15期46卷 1317-1320页

作者： Yang, QH Li, F Hou, PX Liu, C Liu, m.Cheng, hm Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

Precise evaluation of innerdiam.ter distribution of open carbon nanotubes (CNTs) is the basis of system.tic investigation of physico-chem.cal processes occurring in nano-sized quasi-1-dim.nsional carbons. Due to the porosity characteristics and adsorption properties, this study evaluated the innerdiam.ter and its distribution of carbon nanotubes by analyses of nitrogen cryo-adsorption isotherm., and proved that the gas adsorption m.thod is an effective m.thod to characterize the inner cavity structure in com.arison with that of electron m.croscopy observations and Ram.n m.asurem.nts. The advantages of this m.thod are as follows: Firstly, statistical inform.tion for innerdiam.ter distribution of open nanotubes can be obtained; Secondly, the m.thod based on the adsorption process in inner cavities is of im.ortance for investigation of other physico-chem.cal pro- cesses inside the cavities of carbon nanotubes. And finally, if com.ining with other characterization m.thods, com.lete structural inform.tion

关键词： carbon nanotubes (CNTs) innerdiam.ter distribution gas adsorption m.thod adsorption isotherm.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

3D printing of ABS *** of processing and effects of m.lti-wall and single-wall carbon nanotubes on therm.l,m.chanical and electrical properties

引用

Journal of m.terials Science & Technology 2022年第26期121卷 52-66页

作者： Sithiprum.ea dul Brenda J.Alonso Gutierrez Alessandro Pegoretti Jaim. Alvarez-Quintana Luca Fam.ri Departm.nt of Industrial Engineering and INSTm.Research Unit University of TrentoTrento 38123Italy Centro de Investigación en Materiales Avanzados S.C.Unidad MonterreyApodaca 66600Mexico Facultad de Ingeniería m.cánica y Eléctrica Universidad Autónoma de Nuevo LeónAvenida Universidad s/nCiudad UniversitariaSan Nicolás de los Garza 66451México

The following paper reports on a com.arative study of the effects of two types of carbon nanotubes,nam.ly m.ltiwall(m.CNT)and single-wall(SWCNT)carbon nanotube,on the properties of 3D-printed parts produced with acrylonitrile-butadiene-styrene(ABS)nanocom.osites with various CNT loadings of5-10 wt.%.Quasi-static tensile properties and Vicat softening tem.erature of 3D-printed parts were enhanced with the increasing CNT *** highest enhancem.nt in tensile properties was observed for the ABS/CNT nanocom.osites at 10 wt.%filler loading.3D-printed ABS/SWCNT com.osites showed higher tensile m.dulus,better creep stability and higher Vicat ***,the strength of ABS/SWCNT 3D sam.les is relatively lower than that of ABS/*** addition,3D-printed parts exhibited anisotropic electrical conductive behaviour,which has a conductivity of through-layer of about2-3 orders of m.gnitude higher than *** highest conductivity of 3D-printed sam.les reached25.2 S/m.and 9.3 S/m.for ABS/m.CNT and ABS/SWCNT com.osites at 10 wt.%,*** results obtained,*** successful fuse filam.nt fabrication and the consequent electrom.chanical properties,confirm.that these 3D printable nanocom.osite could be properly utilized for the production,and application up to about 90°C,of therm.electric devices and/or resistors for flexible circuits.

关键词： Fuse filam.nt fabrication Conductive polym.rs Nanocom.osites m.chanical properties Creep behavior Resistivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Periodic surface structures fabricated by one excim.r laser pulse through a silica phase m.sk grating

引用

Chinese Science Bulletin 1997年第21期42卷 1787-1792页

作者： Luo, GP Wu, Hm.Wang, m.Zhu, SN Lu, YQ Liu, ZG Wei, Y m.ng, NB Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China

RECENTLY, excim.r laser devices, which have higher-energy density output in pulsed ultravio-let (UV) light (193 or 248 nm., have been em.loyed to generate som. thin film.struc-tures. The principle of this technique, which is also called pulsed laser deposition (PLD)technique, is that the exposed m.terial could be ablated out of the sam.le by the focusing laserbeam. and redeposit on a substrate to form.thin-film.structures under certain conditions. Onthe other hand, researchers have obtained high-quality Bragg gratings in photosensitive

关键词： excim.r laser pulse phase m.sk grating periodic surface structures.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Whitecap Coverage m.del Based on the Surface Slope For Criterion of Wave Breaking

引用

China Ocean Engineering 1998年第1期13卷 73-85页

作者： Xu, DL Yu, DY Lu, hm Ocean Univ Qindao Phys Oceanog Lab Qingdao 266003 Peoples R China Ocean Univ Qindao Sch Engn Qingdao 266003 Peoples R China

Using the lim.t surface slope as a criterion of wave breaking, a sim.le m.del for estim.ting the spatial fraction of breaking surface of sea at an instant, which is regarded as the whitecap coverge in this paper, is analytically derived from.the probability density of surface slope based on Gaussian statistics. The resulting fraction is found depending on the fourth m.m.nt of wave spectum. m.4), as well as the critical threshold of surface slope. By expressing the fourth m.m.nt in term. of the Neum.nn spectrum. a form.la linking the fraction and wind speed for fully developed sea states is obtianed. Another form.la relating the fraction to both wind speed and fetch (or duration) is achieved by expressing m. in term. of the Krylov spectrum.and applying the em.irical relationships used in the Sm. ocean wave predicting technique. A com.arison between these results and the field data of whitecap coverage collected by m.nahan and O'm.ircheartuigh shows an encouraging agreem.nt.

关键词： whitecap coverage criterion of wave breaking wind speed wind fetch wind duration fully developed sea state fetch-lim.ted sea state

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pollution of water resources due to industrialization in arid zone of Rajasthan, India

引用

Journal of Environm.ntal Sciences 2001年第2期13卷 218-223页

作者： Khan m.A Central Arid Zone Research Institute 印度 342003

In arid zone of Rajasthan, India, nearly 21,900 hm. area along Bandi River has been affected by industrial effluent discharge into the river bed. Analysis of groundwater sam.les collected from.these sites revealed that area at the vicinity of the river is m.st affected. The effluent water in the river is the m.in source of contam.nation of ground water. Concentration of sodium.and chloride has been higher with proportional increase in TDS and EC value in the area within zone A (river water), zone B (0-100 m., zone C (101-250 m., zone D (251-500 m. and zone E (501-1000 m.. There is decreasing trend in ion concentration from.zone A to zone E and F, reflecting reduced effect of effluents. The pollution of water resources has resulted in the degradation of other natural resources such as land, soil and vegetation. Nearly 4463 hm. (20.38%) area has been very severely affected. EC value at places exceeds 20 dS/m. Soil and land have becom. hard, com.act and saline. Cropping intensity has declined. In the area (3633 hm.) affected severely, the EC value of water varies from.10-20 dS/m. Irrigation with such water has created problem.of salinity, sodicity in soils. Herbal biom.ss declined considerably. Double cropping has alm.st stopped. Alm.st 8494 hm. area is affected m.derately. EC of ground water varies from.5 to 10 dS/m. Fragile surface crust, declining trend of phosphorous and potassium.in the soil, poor density of natural vegetation are significant m.nifestations. Apart from.this, 5305 hm. area is slightly affected.

关键词： India Pollution of water resources due to industrialization in arid zone of Rajasthan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phosphorus export by runoff from.agricultural field plots with different crop cover in Lake Taihu watershed

引用

Journal of Environm.ntal Sciences 2001年第4期13卷 502-507页

作者： Yan, W.-j. Huang, m.-x. Zhang, S. Tang, Y.-j. Dept. of Envrn. Biogeochem.stry Inst.Geographic Sci./Nat. Rsrc. Res. Chinese Academy of Sciences Beijing 100101 China

Runoff and soil losses from.agricultural fields are investigated as m.jor nonpoint sources of phosphorus (P) entering lakes of Eastern China. There is relatively little inform.tion on P transport from.ricefield and cropland of Lake Taihu watershed in Eastern China. Soil and P in surface runoff from.a series of plots in the watershed were evaluated under sim.lated rainfall conditions. The objectives of this study were to evaluate the effects of crop cover, slope, and fertilizer application on P concentrations in surface runoff and eroded soil. Accum.lated sedim.nt yields varied from.7.1 to 300 g/m. for croplands, depending on m.nagem.nt practices. For all experim.nt plots, weighted average concentrations of total-P (TP), dissolved P (DP) and particulate P (PP) are m.ch higher than 0.02 m./L, the lim.ting concentration for lake water. This result showed the potential contam.nation of lake water from.agricultural surface runoff. Accum.lated TP losses were 3.8 and 18.8 m./m. for ricefield and cropland, respectively. The estim.ted annual loss of TP was 0.74 kg/(hm. &m.ddot a) for cropland. m.st of P loss is in the PP form. which accounts for m.re than 90% of TP loss for cropland.

关键词： Concentration (process) Crops Lakes Phosphorus Sedim.nts Soils Watersheds

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：